VOLUilES OXE TO TWENTY-FIVE. 



207 



svstom, as tried by J. B. Lawes and 

 Dr. Gilbert at liothamsted, xvii. 582 ; 

 .soil of the trial field described, 583 ; 

 kind of implements used, 581; results 

 of exiwriments, 586; efiects of fallow 

 explained, 587 ; Mr. Smith's explanation 

 of tlie faihu'c of the Lois Weedon 

 sj'stem at Kothamsted, 588 ; experi- 

 ments challenging explanation, 589. 



Wheat growing at Lois Weedon (Eev. S. 

 Smith), XAnii. 30 ; the soil, uatm'ally or 

 artificially fitted for wheat, must be pul- 

 verised, lb. ; mineral food being thus 

 ]n-o\ided, tlic organic comes of itself, 

 31 ; overfeeding the plant with nitro- 

 genous food injurious, ib. ; Mr. Lawes's 

 ihilm-e at Kothamsted accounted for, 

 :]3 ; too much subsoil brought up at in- 

 creased cost (34), and the seed sown too 

 late, 35, 



' , gennination of, at different depths, 



diagram and ex}3eriments, by Petri (Buck- 

 land), xvii. 176; mischief of deej) 

 sowing, ib. ; rootlets, the sheaths of true 

 roots, 177 ; diagrams of young plants, 

 17S; tillering, 179; spring growtli, 180; 

 its peculiarities, 181 ; results from 

 .sowuig in difierent months of the year, 

 ib. ; efiects of ti'ansplanting, 182 ; ditto 

 (if repeatedly cutting down, ib. ; accli- 

 )nati.satiou, 183 ; seetl- wheat to be taken 

 from cold and poor soil, 183 ; nitrogenous 

 manures remiuierative, 184; manures 

 most commonly used, 187 ; effects of 

 salt, 188 ; the lifting or throwing out of 

 the wheat plant, how caused, 189; in 

 the lias and Oxford clays, diagram, 190. 



, object of the -wmter rest, in (Liebig), 



xxiv. 433. 



, on the weight and feeding quality of 



(Eeiset), xxiv. 439. 



shocks to face east and west (Spear- 

 ing), xxi. 22. 



straw, cut, of no avail as manure for 



meadows (Lawes and Gilbert), xix. 563. 



, analysis of (Dr. Voelcker), xxii. 392 ; 



ripe and over-ripe samples, 394. 



, top-diessings for (Dr. Voelcker), xx. 



386; some forms of nitrogen act more 

 rapidly on wheat than others, ib. ; efiects 

 of shoddy aj^parent only after harvest, 

 ib. ; want of scientific experiments under 

 varied conditions of soil, &c., 387 ; their 

 difficulty, 388 ; trials with guano, nitrate 

 of soda, &c., ib.; the soil, 389; jilot 1, 

 Peruvian guano tried, 390 ; plot 2, nitrate 

 of .soda, ib. ; plot 3, nitrate of soda 

 and salt, 391 ; plot 4, Proctor's wheat 

 manure, ib. ; plot 5, ditto larger dressing, 

 392 ; plot 6, unmanured, 392 ; plot 7, 

 challv-marl, ib. ; table of results, Proc- 



tor's manure, the highest, 393 ; straw 

 per acre, 394 ; profit fiom use of manures, 

 396 ; guano and wheat maniue less ex- 

 hausting than nitrate to the field, 397. 



Whe.at, top-dressings for (Dr. Voelcker;, 

 xxiii. 16; experiments in 1860, analysis 

 of soil and description of experimental 

 plots, 17; table of di-essings, 18; plot 1, 

 produce from wheat manure, ib. ; plot 2, 

 Peruvian guano, 19; plot 3, nitrate of 

 soda, ib. ; plot 4, soda and salt, 20 ; 

 plot 5, salt, ib. ; plot 6, unmanured, ib. ; 

 plot 7, sulphate of ammonia, 21 ; plot 8, 

 soot, ib. ; its analysis, 22 ; comparison 

 of crops with those of 1859 and that of 

 the unmanured plot of 1860, 22 ; tables 

 of com and straw produce, and explana- 

 tions, 23 ; manxu-es for poor wheat land, 

 ib. ; salt alone of little or no service, 24 ; 

 table of money value of increase, ib; 

 conclusions, comparative values of dif- 

 ferent manines, 25 ; experunents in 

 1861, manures employed, ib. • analysis 

 of ulmate of ammonia, ib. ; analysis of 

 soil of experimental plots, 26 ; table of 

 di'essings, ib. ; produce, 27 ; comparative 

 results, 28 ; variable effects of same 

 manure in different years, how accoimted 

 for, 29 ; liberal use of nitrogenised top- 

 dressings economical, 30 ; treatment of 

 guano, ib. ; money value of increase 

 from use of different manures, ib. 



experiments in 1862, xxiv. 100 ; com- 

 position of soil of experimental field, ib. ; 

 subsoil, 101 ; cropping, ib. ; di'essing of 

 different plots, ib. ; experiments to ascer- 

 tain the most economical application of 

 nitrate of soda, 102; results with nitrate 

 of soda and .salt in different proportions, 

 plots 1, 2, 3, 103; nitrate alone, 

 plot 4 ; plot 5, unmanm-ed, 104 ; 

 plot 6, nitrate, ib. ; plot 7, guano and 

 salt, 105; plot 8, guano alone, ib.; 

 table of results, 106; value of nitrate as 

 a wheat manure, ib. ; effects of salt alone 

 and in addition to nitrate or guano, ib. ; 

 titility of guano and salt on light land, 

 ib. ; table of money value of increase, 

 108; rules for the use of nitrate on 

 difierent soils, ib. ; Mr. Stratton's ex- 

 periments, 109 ; Mr. Frere's experience, 

 ib. ; conditions affecting the value of 

 nitrate as applied to wheat, 110. 



, experiments on the growth of, for 



twenty years in succession on the same 

 land (Lawes and Gilbert), xxv. 93 ; 

 economic application of chemical science, 

 94; researches and publications of 

 Boussingault, ib. ; Liebig's mineral 

 theorj', 95 : his recent contradiction of 

 his early views, 96; De Saussure's re- 



